python2.5 PyArg_ParseTuple fix Python 2.5 doesn't like it when we mix str objects and the "t#" format in PyArg_ParseTuple. Change it to use "s#". Tested with python 2.3, 2.4 and 2.5.

changeset:   0:9426b370c206
tag:         tip
user:        My Name <myname@example.com>
date:        Mon Jan 12 13:46:40 1970 +0000
summary:     commit-1